This is hard to answer because it can always be argued that maintaining the system of legitimacy is in the selfish interest of the rulers.
As far as rulers prioritizing legitimacy over (other) selfish interests, one good example is the peace of Vienna, especially the handing over France in its pre-revolutionary borders to the Bourbons, despite them being in no position to negotiate, simple to establish the principle that the revolutionary government had never been the legitimate government of France.
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